题目内容
(请给出正确答案)
[主观题]
What does the word "they" (Para. 3) refer to?A.the layersB.wind-blow]a depositsC.volcanic
What does the word "they" (Para. 3) refer to?
A.the layers
B.wind-blow]a deposits
C.volcanic eruptions
D.the terrestrial rocks
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